A parallel plate capacitor is immersed in liquid of dielectric constant K. Find force per unit area acting on plate from the liquid from dielectric in contact with the plate.

Question

 

$(A)\;\frac{KV^2}{2d^2} \\ (B)\;\frac{KV^2}{2d^2}\in _0 \\ (C)\; \frac{\in _0 (K-1)V^2}{2d^2K} \\ (D)\;\frac{K(K-1) \in _0 V^2 }{2d^2} $